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The recommendations for daily intake vary between 12-15 mg per day for men or 8-12 mg for women, and the UL (tolerable upper intake) is 40 mg. A low dose zinc supplement should be all that is needed to prevent a deficiency, although up to 30 mg is commonly taken with relative safety.
Total zinc intakes of 60 mg/day (50 mg supplemental and 10 mg dietary zinc) have been found to result in signs of copper deficiency. Copper deficiency has also been reported following chronic use of excessive amounts of zinc-containing denture creams (>2 tubes per week containing 17-34 mg/g of zinc; 99).